Summary  
This chapter covers how to derive a concise, non-overlapping set of classification categories with one-sentence definitions by analyzing sample data and iteratively refining the taxonomy.

General domain of usage  
Message classification in automated systems.

**Categories** are the backbone of the whole system. Every later step, classification, tone matching, template selection, depends on having a category list that is clear and doesn't overlap.
 
A good category list is usually short, five to eight categories is common, and each one has a **one-sentence definition** that would let two different people agree on how to classify the same message.
 
In this lab, you will use the sample messages you generated in Lab 1.2 and let Claude propose categories based on what it actually sees in them, rather than guessing categories in the abstract.

> ## Task
> Ask Claude to review the sample messages already in your workspace and propose categories from them, not from assumptions.
>
> > <b>Review the sample messages in my messages folder and propose a set of categories that covers them all, with a short definition for each.
>
> Read through the proposed list. If two categories feel like they overlap, ask Claude to merge or clarify them before you save the final version.

Build a complete AI-powered communication system using Claude. You will learn how to judge tone and audience, match messages to the right channel, extract key points, draft clear communications, and organize everything into a reusable workflow.

Learn what makes a communication system reliable and how to prepare a structured workspace before drafting messages. You will define message categories, set style guidelines, and classify messages by type and audience.

Learn how to judge tone and audience fit, adapt messages, flag sensitive situations, and pull out the details a draft needs. You will adapt tone for different readers, flag high-stakes messages, extract key points, and handle conflicting expectations.

Turn everything you've built into finished messages. You will build reusable templates, generate final drafts, review them for tone and style compliance, and turn the process into a reusable Claude workflow.